The author states, "When we reason within a logical framework, words must be manipulated according to the rules of the game...." Her site offers an opportunity to learn about the terms not, ...More: lessons, discussions, ratings, reviews,...

Find the fewest number of weighings that will identify which of the nine coins is counterfeit. A link to a Java applet from The National Library of Virtual Manipulatives (NLVM) is provided to help stu...More: lessons, discussions, ratings, reviews,...

Shapes have many different properties such as the lengths of their sides, measures of interior angles, and symmetry. This tool allows the user to use a Venn diagram model to sort shapes based on their...More: lessons, discussions, ratings, reviews,...

If you like word puzzles, enjoy a good word game with friends, or can't wait for the Sunday paper with a new crossword puzzle, you'll enjoy this collection of word Plexers. Plexers are puzzles where c...More: lessons, discussions, ratings, reviews,...

This material is based upon work supported by the
National Science Foundation under Grant DUE-0226284.
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